Akademik Veri Yönetim Sistemi
Academic Journal of Science, cilt.6, sa.1, ss.461-468, 2016 (Hakemli Dergi)
There has recently been much interest in developing new materials for use in replacing and repairing natural bone. Bone is a composite material with a high modulus filler, hydroxyapatite, in a collagen matrix. Powder hydroxyapatite (HA) reinforced polymer composite has been developed since early 1980s as an analogue material for bone replacement. Hydroxyapatite reinforced polymer composites offer a robust system to engineer synthetic bone substitutes with tailored mechanical, biological, and surgical functions. The basic design rationale has been to reinforce a tough, compatible polymer matrix with a HA filler. In this investigation, composites of polypropylene and hydroxyapatite were prepared. The effects of hydroxyapatite ratio on the mechanical, thermal and morphological properties of the polymer composites is presented. Biological and synthetic hydroxyapatite, in three different concentrations (10, 20 and 30 wt %), was added to PP to produce composites. The mechanical properties, including the elastic modulus, yields strengths, tensile strengths, strain at tensile strengthIzod impact resistance, hardness, density and the thermal properties, such as the Vicat softening point, heat deflection temperature and melt-flow index, of the composites were investigated. The tensile test results showed that HA ratio were effective for the elastic modulus, tensile strength, and the strain at tensile strength. A considerable increase in the elastic modulus was found with a 30% HA concentration. The maximum hardness was obtained with 30% biological hydroxyapatite. The increased. HA content caused the HDT and Vicat values to increased, whereas the melt-flow index and Izod impact strength showed a decreased as the HA content increased. The structure of the composites were investigated by scanning electron microscopy and compared to mechanical and thermal properties as a function of HA content.